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Hallucinogen
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Homework Statement
This isn't homework, rather it's regular work. I have a >97% solution of 1-thioglycerol, the density of which is 1.25 g/mL. I am trying to get a 1.5 x 10-4 M solution at the end, and I suspect the instructions I have been given are incorrect.
Molar mass = 108.16
Homework Equations
Concentration = Density / molar mass.
The Attempt at a Solution
The molarity of my stock solution is (1.25 * 1000) = 1250 g/L. 1250 / 108.16 = 11.5 M.
I am instructed to make a 10-fold dilution, giving me a molarity of 1.15 M.
I should then take 6.5 microlitres and add this to a final volume of 100 millilitres.
But 1.15 x (6.5 x 10^-6) = 7.5 x 10^-6. Divided by (100 x 10^-3) = 7.5 x 10^-5 M, which is half the concentration I need?
Thanks, Adam.